A Difference Between Software Transactional Memory (STM) and Hardware Transactional

question 47

Multiple Choice

A difference between software transactional memory (STM) and hardware transactional memory (HTM) is that

• A) HTM uses cache hierarchy and cache coherency protocols while STM uses software implementation in addition to the cache hierarchy and cache coherency protocols.
• B) STM requires no special code instrumentation and thus has less overhead than HTM.
• C) In HTM, code is inserted by a compiler, while in STM, user enters the appropriate code.
• D) HTM requires existing cache hierarchies and cache coherency protocols be modified, while STM does not.

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